Hmm. If you are rendering in 1 to 2 second chunks, then it would probably be better to render as individual images. That would allow you to assemble them in Quicktime (current version is QT6 ) and choose what compression you wanted. It would also give you some safety, as in if something interrupts your render, you would have the individual frames already done safe, and could resume from the point of the last good frame render. As for assembling animated avi or mpegs; you might want to hop onto Usenet and look at the multimedia groups. Their faqs usually will list the freeware and shareware movie file assemblers that are used to rebuild movies that are posted for download. About all you would have to do is alter the name of the animation file so that the sections are numbered in the sequence you want to view them ( Posette jump001.avi,002.avi...like that), as most of the programs there look for those numerical tags to sequence things correctly. If you need more than that, such as the ability to add a sound track, then you're looking at more capable programs. The current cadillac is Adobe Premiere. It can do just about anything you need, and costs it. An alternative is the video editor suite by Magix. It does video import, editing, and soundtrack insertion, and it is pretty reasonable (around $50 US). A browse at the computer store's software rack should turn up others that are cheaper, and less capable.